﻿SOME 
  NEW 
  SPECIES 
  OF 
  THE 
  GENUS 
  PHREODRILUS. 
  279 
  

  

  cytoplasm 
  is 
  very 
  granular 
  and 
  takes 
  the 
  stain 
  deeply; 
  in 
  the 
  

   entire 
  isolated 
  specimen 
  the 
  cells 
  are 
  vesicular 
  in 
  form, 
  but 
  in 
  

   sections 
  (fig. 
  9, 
  b.) 
  they 
  appear 
  quite 
  low. 
  This 
  glandular 
  

   region 
  passes 
  directly 
  backwards 
  below 
  the 
  gut, 
  and 
  gradually 
  

   opens 
  out 
  to 
  form 
  the 
  ampulla 
  {c), 
  the 
  epithelium 
  of 
  which 
  is 
  

   flat; 
  this 
  ampulla 
  occupies 
  Segments 
  XIV 
  and 
  XV, 
  being 
  

   slightly 
  constricted 
  by 
  the 
  septum, 
  and 
  is 
  filled 
  with 
  ripe 
  

   spermatozoa 
  ; 
  there 
  is 
  no 
  speriuatophore. 
  

  

  The 
  absence 
  of 
  a 
  distinctly 
  dilated 
  sac 
  at 
  the 
  external 
  end 
  of 
  

   the 
  duct, 
  opening 
  to 
  the 
  exterior, 
  is 
  in 
  contrast 
  to 
  the 
  

   arrangement 
  in 
  other 
  species. 
  Lying 
  close 
  to 
  and 
  behind 
  the 
  

   aperture 
  of 
  this 
  spermatheca 
  is 
  a 
  peculiarly 
  modified 
  chaetal 
  

   sac, 
  containing 
  two 
  copulatory 
  chaetse 
  (figs. 
  3, 
  9). 
  This 
  organ 
  

   is 
  ovoid, 
  or 
  subglobular; 
  its 
  wall 
  is 
  formed 
  of 
  long 
  cells, 
  

   containing 
  very 
  fine 
  granules 
  ; 
  these 
  cells 
  are 
  arranged 
  with 
  

   their 
  longer 
  axes 
  directed 
  obliquely 
  to 
  the 
  lumen, 
  with 
  the 
  

   nuclei 
  at 
  their 
  bases. 
  

  

  The 
  " 
  copulatory 
  chaetas 
  " 
  are 
  more 
  delicate 
  than 
  the 
  

   normal 
  ventral 
  cheetge, 
  and 
  the 
  free 
  end 
  is 
  sharply 
  curved 
  and 
  

   more 
  hook-like. 
  

  

  In 
  the 
  entire 
  individual 
  the 
  area 
  of 
  skin 
  surrounding 
  the 
  

   spermathecal 
  pore 
  and 
  the 
  copulatory 
  cheetae 
  is 
  depressed, 
  so 
  

   that 
  the 
  two 
  organs 
  appear 
  to 
  open 
  together 
  (fig. 
  3), 
  but 
  

   longitudinal 
  sections 
  show 
  their 
  true 
  relation 
  as 
  above 
  

   described 
  (fig. 
  9). 
  Only 
  in 
  P. 
  kerguelenensis 
  has 
  such 
  an 
  

   apparatus 
  been 
  hitherto 
  described 
  ; 
  and 
  Michaelsen's 
  account 
  

   differs 
  in 
  two 
  points 
  from 
  the 
  above 
  ; 
  firstly, 
  he 
  finds 
  only 
  one 
  

   chaeta 
  in 
  each 
  organ 
  ; 
  secondly, 
  the 
  latter 
  opens 
  in 
  common 
  

   with 
  the 
  spermatheca. 
  The 
  form 
  of 
  the 
  bristle 
  in 
  his 
  fig. 
  1 
  

   is 
  similar 
  to 
  that 
  of 
  P. 
  lacustris. 
  It 
  is 
  noteworthy 
  that 
  

   Beddard 
  expressly 
  states 
  that 
  there 
  are 
  no 
  copulatory 
  chaeta3 
  

   in 
  the 
  South 
  American 
  species; 
  otherwise 
  one 
  might 
  have 
  

   been 
  tempted 
  to 
  lay 
  stress 
  on 
  this 
  feature 
  as 
  of 
  generic 
  

   importance 
  and 
  associated 
  with 
  the 
  absence 
  of 
  a 
  muscular 
  

   atrial 
  sac. 
  

  

  Localities. 
  — 
  This 
  species 
  was 
  obtained 
  from 
  Lakes 
  

   Wakatipu 
  (Hauls 
  20, 
  23, 
  25) 
  and 
  Manapouri 
  (Haul 
  1), 
  

  

  